I-BEAM SIDE RAIL TYPE; EXTRUDED FABRICATED ALUMINUM MATERIAL; 15-3/4 INCH BASE WIDTH; 200 LOAD RATING IN LB; 200 LB LOAD RATING; PARALLEL BASE TYPE; 2 SECTION(S); 1-1/4 INCH FLAT D RUNG SIZE; WERNER. BRAND; APPLICABLE STANDARD ANSI A14.2, OSHA, UL